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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3588c679ba0beb13e2ac795ac2a7c2c647415486c6123f9883c08c40d3d666cc' 
  AND token = 'xJenRn87o1ZgdbA11jRkW2WD37m4P2CSf2ZFeq8bmj8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}